| /* |
| * Copyright 2020 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package androidx.compose.ui.text.android |
| |
| import android.os.Build |
| import android.text.Layout |
| import android.text.StaticLayout |
| import android.text.TextPaint |
| import androidx.test.filters.SmallTest |
| import com.google.common.truth.Truth.assertThat |
| import org.junit.Test |
| import org.junit.runner.RunWith |
| import androidx.test.ext.junit.runners.AndroidJUnit4 |
| |
| @SmallTest |
| @OptIn(InternalPlatformTextApi::class) |
| @RunWith(AndroidJUnit4::class) |
| class LayoutHelperParagraphTest { |
| |
| private val WIDTH = 100 |
| private val TEXT_PAINT = TextPaint() |
| |
| private fun buildLayoutHelper(text: String): LayoutHelper = |
| if (Build.VERSION.SDK_INT < 23) { |
| @Suppress("DEPRECATION") StaticLayout( |
| text, TEXT_PAINT, WIDTH, |
| Layout.Alignment.ALIGN_NORMAL, 1f, 0f, false |
| ) |
| } else { |
| StaticLayout.Builder.obtain(text, 0, text.length, TEXT_PAINT, WIDTH).build() |
| }.let { |
| LayoutHelper(it) |
| } |
| |
| @Test |
| fun testParagraphInfo() { |
| val layoutHelper = buildLayoutHelper("a\nb\nc") |
| assertThat(layoutHelper.paragraphCount).isEqualTo(3) |
| |
| assertThat(layoutHelper.getParagraphStart(0)).isEqualTo(0) |
| assertThat(layoutHelper.getParagraphEnd(0)).isEqualTo(2) |
| |
| assertThat(layoutHelper.getParagraphStart(1)).isEqualTo(2) |
| assertThat(layoutHelper.getParagraphEnd(1)).isEqualTo(4) |
| |
| assertThat(layoutHelper.getParagraphStart(2)).isEqualTo(4) |
| assertThat(layoutHelper.getParagraphEnd(2)).isEqualTo(5) |
| } |
| |
| @Test |
| fun testParagraphInfo_singleParagraph() { |
| val layoutHelper = buildLayoutHelper("Hello, World.") |
| assertThat(layoutHelper.paragraphCount).isEqualTo(1) |
| |
| assertThat(layoutHelper.getParagraphStart(0)).isEqualTo(0) |
| assertThat(layoutHelper.getParagraphEnd(0)).isEqualTo(layoutHelper.layout.text.length) |
| } |
| |
| @Test |
| fun testParagraphInfo_ignoreLastLineFeed() { |
| val layoutHelper = buildLayoutHelper("Hello, World.\n") |
| assertThat(layoutHelper.paragraphCount).isEqualTo(1) |
| |
| assertThat(layoutHelper.getParagraphStart(0)).isEqualTo(0) |
| assertThat(layoutHelper.getParagraphEnd(0)).isEqualTo(layoutHelper.layout.text.length) |
| } |
| |
| @Test |
| fun testParagraphInfo_emptyText() { |
| val layoutHelper = buildLayoutHelper("") |
| assertThat(layoutHelper.paragraphCount).isEqualTo(1) |
| |
| assertThat(layoutHelper.getParagraphStart(0)).isEqualTo(0) |
| assertThat(layoutHelper.getParagraphEnd(0)).isEqualTo(0) |
| } |
| |
| @Test |
| fun testParagraphInfo_lineFeedOnlyCases() { |
| val layoutHelper = buildLayoutHelper("\n") |
| assertThat(layoutHelper.paragraphCount).isEqualTo(1) |
| |
| assertThat(layoutHelper.getParagraphStart(0)).isEqualTo(0) |
| assertThat(layoutHelper.getParagraphEnd(0)).isEqualTo(layoutHelper.layout.text.length) |
| } |
| |
| @Test |
| fun testParagraphInfo_lineFeedOnlyCases2() { |
| val layoutHelper = buildLayoutHelper("\n\n") |
| assertThat(layoutHelper.paragraphCount).isEqualTo(2) |
| |
| assertThat(layoutHelper.getParagraphStart(0)).isEqualTo(0) |
| assertThat(layoutHelper.getParagraphEnd(0)).isEqualTo(1) |
| |
| assertThat(layoutHelper.getParagraphStart(1)).isEqualTo(1) |
| assertThat(layoutHelper.getParagraphEnd(1)).isEqualTo(layoutHelper.layout.text.length) |
| } |
| |
| @Test |
| fun testParagraphForOffset() { |
| val layoutHelper = buildLayoutHelper("aa\nbb\ncc") |
| assertThat(layoutHelper.getParagraphForOffset(0)).isEqualTo(0) |
| assertThat(layoutHelper.getParagraphForOffset(1)).isEqualTo(0) |
| assertThat(layoutHelper.getParagraphForOffset(2)).isEqualTo(0) |
| assertThat(layoutHelper.getParagraphForOffset(3)).isEqualTo(1) |
| assertThat(layoutHelper.getParagraphForOffset(4)).isEqualTo(1) |
| assertThat(layoutHelper.getParagraphForOffset(5)).isEqualTo(1) |
| assertThat(layoutHelper.getParagraphForOffset(6)).isEqualTo(2) |
| assertThat(layoutHelper.getParagraphForOffset(7)).isEqualTo(2) |
| } |
| |
| @Test |
| fun testParagraphForOffsetUpstream() { |
| val layoutHelper = buildLayoutHelper("aa\nbb\ncc") |
| assertThat(layoutHelper.getParagraphForOffset(0, true)).isEqualTo(0) // a |
| assertThat(layoutHelper.getParagraphForOffset(1, true)).isEqualTo(0) // a |
| assertThat(layoutHelper.getParagraphForOffset(2, true)).isEqualTo(0) // \n |
| assertThat(layoutHelper.getParagraphForOffset(3, true)).isEqualTo(0) // b* |
| assertThat(layoutHelper.getParagraphForOffset(4, true)).isEqualTo(1) // b |
| assertThat(layoutHelper.getParagraphForOffset(5, true)).isEqualTo(1) // \n |
| assertThat(layoutHelper.getParagraphForOffset(6, true)).isEqualTo(1) // c* |
| assertThat(layoutHelper.getParagraphForOffset(7, true)).isEqualTo(2) // c |
| } |
| |
| @Test |
| fun testParagraphForOffset_lineFeedOnlyCase() { |
| val layoutHelper = buildLayoutHelper("\n\n") |
| assertThat(layoutHelper.getParagraphForOffset(0)).isEqualTo(0) |
| assertThat(layoutHelper.getParagraphForOffset(1)).isEqualTo(1) |
| } |
| |
| @Test |
| fun testParagraphDirection() { |
| val layoutHelper = buildLayoutHelper("aa\nאא\ncc") |
| assertThat(layoutHelper.isRtlParagraph(0)).isFalse() |
| assertThat(layoutHelper.isRtlParagraph(1)).isTrue() |
| assertThat(layoutHelper.isRtlParagraph(2)).isFalse() |
| } |
| |
| @Test |
| fun testParagraphDirection_case2() { |
| val layoutHelper = buildLayoutHelper("אא\nbb\nאא") |
| assertThat(layoutHelper.isRtlParagraph(0)).isTrue() |
| assertThat(layoutHelper.isRtlParagraph(1)).isFalse() |
| assertThat(layoutHelper.isRtlParagraph(2)).isTrue() |
| } |
| } |
